Universal basic income.
Everyone gets one, regardless of station.
Additional income from other endeavors is allowed, and still encouraged.
Robotics makes this possible and perhaps even inevitable.
It would lead to an economic boom because so many more people could participate in the economy.
The end of homelessness.
People who are mentally ill or deficient would see their income used towards their care.
This breaks no laws of economics.
Yes, those who make outrageous incomes would pay higher taxes than they do now, an eminently good thing.
It would be a politically stabilizing influence.
People who earn more tend to have fewer children, not more.
Less inequality, more free agency.
Yes, people would engage in recreation, but ultimately would want to do something productive, if only to find fulfillment and avoid boredom.
I'm still looking for a downside.